Stream vs Mapped IO (was Re: [VOTE] - Entry level JSDK 1.4 in Cocoon 2.2)

[Jorg Heymans <jh...@domek.be>]

Has anyone else read Bruce Eckel's "Thinking in Java" ?

<quote> (chapter 12)
Although the performance of “old” stream I/O has been improved by 
implementing it with nio, mapped file access tends to be dramatically 
faster.
</quote>

So by switching to 1.4 and *not* using NIO you're likely to get a speed 
bump already.

However switching to mapped file access (as was suggested before using 
memory mapped files) from traditional stream IO would gain the most 
significant increase.

<quote>
Stream Write: 1719
Mapped Write: 359
Stream Read: 750
Mapped Read: 125
Stream Read/Write: 5188
Mapped Read/Write: 16
</quote>

I am getting similar results over various runs. The test program is 
attached (needs the test harness classes to run, but you can see what 
he's doing)

The third edition including code samples is freely available from 
http://mindview.net/Books/DownloadSites

I hope this helps making the decision 1.4 vs 1.3. I also started a poll 
on the userlist to get a feeling of what the installed userbase is using 
at the moment. I'll gather some stats and report back.


Regards
Jorg

Antonio Gallardo wrote:

> Hi:
> 
> Many was talked about this topic. I think it not need a large explanation:
> 
> The idea is to set JSDK 1.4 as the minimum supported JDK supported for the
> next major release 2.2 of Cocoon. Currently we are supporting also 1.3 but
> seems like few people is using it.
> 
> Do you agree with JSDK 1.4 as the lower Java version supported in Cocoon 2.2?
> 
> Here is my +1
> 
> Best Regards,
> 
> Antonio Gallardo
> 

RE: Stream vs Mapped IO (was Re: [VOTE] - Entry level JSDK 1.4 in Cocoon 2.2)

[Carsten Ziegeler <cz...@s-und-n.de>]

I'm not against considering 1.4 for 2.2, but please have in mind
that we have to maintain 2.1.x first which is JDK 1.3 based and
we need a replacement for Jisp there.

Carsten 

> -----Original Message-----
> From: news [mailto:news@sea.gmane.org] On Behalf Of Jorg Heymans
> Sent: Tuesday, March 02, 2004 9:33 AM
> To: dev@cocoon.apache.org
> Subject: Stream vs Mapped IO (was Re: [VOTE] - Entry level 
> JSDK 1.4 in Cocoon 2.2)
> 
> Has anyone else read Bruce Eckel's "Thinking in Java" ?
> 
> <quote> (chapter 12)
> Although the performance of "old" stream I/O has been 
> improved by implementing it with nio, mapped file access 
> tends to be dramatically faster.
> </quote>
> 
> So by switching to 1.4 and *not* using NIO you're likely to 
> get a speed bump already.
> 
> However switching to mapped file access (as was suggested 
> before using memory mapped files) from traditional stream IO 
> would gain the most significant increase.
> 
> <quote>
> Stream Write: 1719
> Mapped Write: 359
> Stream Read: 750
> Mapped Read: 125
> Stream Read/Write: 5188
> Mapped Read/Write: 16
> </quote>
> 
> I am getting similar results over various runs. The test 
> program is attached (needs the test harness classes to run, 
> but you can see what he's doing)
> 
> The third edition including code samples is freely available 
> from http://mindview.net/Books/DownloadSites
> 
> I hope this helps making the decision 1.4 vs 1.3. I also 
> started a poll on the userlist to get a feeling of what the 
> installed userbase is using at the moment. I'll gather some 
> stats and report back.
> 
> 
> Regards
> Jorg
> 
> Antonio Gallardo wrote:
> 
> > Hi:
> > 
> > Many was talked about this topic. I think it not need a 
> large explanation:
> > 
> > The idea is to set JSDK 1.4 as the minimum supported JDK 
> supported for 
> > the next major release 2.2 of Cocoon. Currently we are 
> supporting also 
> > 1.3 but seems like few people is using it.
> > 
> > Do you agree with JSDK 1.4 as the lower Java version 
> supported in Cocoon 2.2?
> > 
> > Here is my +1
> > 
> > Best Regards,
> > 
> > Antonio Gallardo
> > 
>